Abstract: For the fast analysis of dynamic stray light of the flexible solar array vibration measurement camera in the space station, the relative angles between three environmental light sources(the sun, the moon and the earth) and optical axis of the camera in the orbital period are computed, meanwhile the dynamic vibration displacements of a large flexible array are simulated, a dynamic stray light discrimination algorithm that significantly reduces the amount of computation is given, based on the analysis of environmental light sources characteristics (point source and area source) and two types of stray light interference ways (direct incidence and incidence after primary reflection). The problem of stray light trajectory changing dynamically with the solar array is solved. The simulation results show that the realtime and accuracy of this algorithm can meet the stray light analysis requirements of large flexible solar array vibration measurement cameras.